Thermal degradation of synthetic lubricating oils: Part II - Rheological study

The characterization of thermal degradation process of synthetic lubricating oils, in relation to its rheological properties, was evaluated in this work. Analyses of the dependence of synthetic lubricant viscosity on temperature have been carried out. Synthetic lubricants were degraded at different temperatures and times, in air atmosphere. After thermal degradation, synthetic lubricant oils were characterized by rheological measurements. In general, the increase in degradation temperature led to an increase of the lubricants viscosity for some lubricant samples.